Which should be avoided when telling people that you have to stop service?

When telling people that you have to stop service, it is best to avoid using "you" statements. "You" statements can be seen as accusatory or judgmental, and they can make the person feel defensive.
Instead, focus on the facts and explain to the person why you are unable to serve them any more alcohol. You can also express your concern for their safety and offer them alternative options, such as food, non-alcoholic beverages, or a ride home.